Curiously, in Esperanto his name (nick-name?) has a meaning: "being good in an objectionable and ugly way". That's because Fibonachi (spelled Fibonacxi or Fibonaĉi depending on preferred convention) in Esperanto can be decomposed into:
Fi- and -aĉ should not be confused with mal-, which negates the following element, i.e. says that the opposite of its meaning applies, and ne-, which denies the following element, i.e. says that the meaning of the following does not apply.